Nice job, I always yearn for something mine-related :D
As it is I don't see a point in placing the tracks in other way than the shortest. Makes me wonder though how this would play if you had to defend the whole screen instead and if you could spawn different kinds of carts, e.g. manned with archers or the gold one for economy to place more tracks / buy more carts.
Viewing post in Mine Defender jam comments
That is the fun part of the gamejam how much can you get done and how many ideas get left behind. These are some good suggestions some we had considered but not all. I had planned for there to be multiple connections you would defend first the mine gathering resources then a tradesman moving a cart to the next town. Thanks for giving it a play.